Definition of toll. 1  transitive verb. 2  1 : to sound (a bell) by pulling the rope. 3  2a : to give signal or announcement of the clock tolled each hourb : to announce by tolling church bells tolled the death of the bishopc : to call to or from a place or occasion bells tolled the congregation to church.  intransitive verb.
The formula that this water intake calculator uses is that for every pound of body weight you need 0.5 ounces of fluid intake per day. Therefore if your body weight is 200 Pounds, you would need 100 ounces of fluid.
Through the skin, about 400ml of water is lost per day. Every day, we breath in about 14000L of air. Assuming that the humidity of exhaled air is 100% and inhaled air is 20%, and using the carrying capacity of 1kg of air to be 20g of water vapour, we can calculate how much water is lost simply by breathing. This estimate gives 400ml of water lost per day too. Thus, a person loses about 800ml of water per day, half through the skin and half through respiration. Resources: 3.2 Insensible Water Loss (water loss rate through skin)